What is the population of Mountainside?

The population of Mountainside, NJ is 6,876.

Where is Mountainside located?

Mountainside, NJ is located at latitude 40.6723200 and longitude -74.3573700. It is in United States.

What is the area of Mountainside?

The area of Mountainside, NJ is 10.487 km².

What is the elevation of Mountainside?

Mountainside, NJ has an elevation of 46 meters (151 feet) above sea level.

What time zone is Mountainside in?

Mountainside, NJ is in the America/New_York time zone.

What state is Mountainside in?

Mountainside is in the state of New Jersey, United States.

What county is Mountainside, NJ in?

Mountainside is in Union County, New Jersey.

How has the population of Mountainside changed?

The population of Mountainside, NJ has increased from 6,685 (2010) to 6,876 (2020), a change of 2.9%.

Mountainside, New Jersey

Mountainside: town

About

Mountainside is a town located in the county of Union in the U.S. state of New Jersey. Its population at the 2010 census was 6,685 and a population density of 637 people per km². After 10 years in 2020 city had an estimated population of 6,876 inhabitants.

The town was created 130 years ago in 1895.

Mountainside locator map — Location of Mountainside on New Jersey map.

Quick Facts about Mountainside

Population	6,876 (2020)
Country	United States of America
State	New Jersey (United States)
County	Union County
Postal code	07092
Phone Area Codes	908
Area	10.49 km²
Latitude & Longitude	40.6723,-74.3574
Altitude	233 feet / 71 meters
Establishment	September 25, 1895 (130 years ago)
Time Zone	Eastern Time Zone
Local time	17:58:37 (22nd April 2026)
Density	656 Pop. per km² as of 2020
Population growth	2.78% (2010-2020)
Weather	69℉ Partly Sunny then Slight Chance Rain Showers 7-days weather

Echo Lake Park in Mountainside NJ autumnal scene image

Geography

Mountainside is located at 40°40'20"N 74°21'27"W (40.6723200, -74.3573700). It has 5 neighbors: Berkeley Heights, Scotch Plains, Springfield, City of Summit and Westfield.

Mountainside map

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Weather

69°F

Partly Sunny then Slight Chance Rain Showers

6 to 10 mph SW Wednesday

A slight chance of rain showers after 2pm. Partly sunny, with a high near 69.

7-Day Forecast

Mountainside has 5 neighbours.

Berkeley Heights township in Union County, New Jersey
Scotch Plains township in Union County, New Jersey, United States
Springfield township in Union County, New Jersey, United States
City of Summit city in Union County, New Jersey, United States
Westfield town in Union County, New Jersey

Demographics

The population of Mountainside increased by 2.78% in 10 years.

Year	Population	% Change	Method
2010	6,685	-	census
2011	6,712	0.4%	estimation process
2012	6,733	0.31%	estimation process
2013	6,781	0.71%	estimation process
2014	6,775	-0.09%	estimation process
2015	6,784	0.13%	estimation process
2016	6,822	0.56%	estimation process
2017	6,841	0.28%	estimation process
2018	6,864	0.34%	estimation process
2019	6,885	0.31%	estimation process
2020	6,876	-0.13%	estimation process

Mountainside zip code is 07092. County name: Union, County fips: 34039

Best Things to Do in Mountainside

1Watchung Reservation

Rating: 4.6 (2679)

Historic Trail, Mountainside, NJ 07092, United States View details

Phone: +19087893670 | Website available

2Echo Lake Park

Rating: 4.6 (959)

1028 Springfield Ave, Mountainside, NJ 07092, United States View details

3The Loop Playground

Rating: 4.7 (250)

Watchung Reservation, Mountainside, NJ, Mountainside, NJ 07092, United States View details

Phone: +19085274900 | Website available

4Trailside Nature & Science Center

Rating: 4.7 (52)

452 New Providence Rd, Mountainside, NJ 07092, United States View details

Phone: +19087893670 | Website available

Services and Civic Places in Mountainside

1Mountainside City Hall

1385 US-22, Mountainside, NJ 07092 View details

Phone: +19082322400 | Website available

People born in Mountainside (4)

People born in Mountainside, including professional wrestler Dale Torborg, painter Alexandra Eldridge, film director Laurie Collyer, .

More notable people

Dean Fasano (American musician) he was born in 16/01/1955

Nearby Schools and Colleges

Schools and campuses linked to Mountainside, NJ. Select a name to open its map and contact details.

Code	Name	City	ZIP
187198	Union County College	Cranford (NJ)	07016-1528

Nearby Transit Stations (21)

Rail and bus stations connected to Mountainside, NJ. Select a station to open its map and address details.

Code	Name	Address	Type
MET	Metropark station	100 Middlesex-Essex Turnpike	RAIL
EWR	Newark Liberty International Airport	Newark Liberty International Airport	RAIL
NWK	Pennsylvania Station	1 Raymond Plaza West	RAIL
NBK	New Brunswick station	French and Albany Streets	RAIL
NYP	Pennsylvania Station	8th Ave 31st Street / 8th Ave 33rd Street	RAIL

Nearby Post Offices

Closest post offices linked to Mountainside.

Post Office Name	City	ZIP
Mountainsid Post Office	Mountainside (NJ)	07092

Other cities in Union County

Cities, towns, neighborhoods & other populated places in Union County , NJ. (more)

City Name	Population	Title
Elizabeth	128,382	The second most populous city in Union County, New Jersey.
Elizabethport	124,969	A city in Union County, New Jersey.
Union	67,137	A city in Union County, New Jersey.
Plainfield	50,011	A city in Union County, New Jersey.
Linden	42,076	A city in Union County, New Jersey.
Rahway	29,832	City in Union County, New Jersey
Westfield	29,238	Town in Union County, New Jersey
Scotch Plains	24,138	Township in Union County, New Jersey, United States
Cranford	24,028	Township of New Jersey
Hillside	21,841	Township of New Jersey
Summit	21,812	City in Union County, New Jersey, United States
Roselle	21,689	Borough in New Jersey, USA
Clark	15,837	Township in southern Union County, New Jersey, United States
New Providence	13,994	Town in New Jersey, United States
Roselle Park	13,510	Borough in Union County, New Jersey
Berkeley Heights	13,313	Township in Union County, New Jersey

Distance to Other Cities

Mountainside distances to largest New Jersey cities